Is there a way to inject environment variables, e.g. REACT_APP_MY_API into the index.html file?
According to this, it can be done, but I can't seem to get it to work.
REACT_APP_MY_API=https://something.com
<script type="text/javascript">
console.log("%REACT_APP_MY_API%") // undefined
console.log("%NODE_ENV%") // development
</script>
I just tried with an (almost) new CRA setup and it works.
<head>
<title>React App</title>
<script type="text/javascript">
console.log("%REACT_APP_TEST%") // OK
console.log("%NODE_ENV%") // development
</script>
</head>
Did you try restarting the server? I just tried changing the test variable with your example and it works if you restart the development server.
As someone pointed out in the comments, the official documentation of CRA has a section about that.
Make sure you restart your create-react-app when adding variables into the .env file
Also make sure you have >= react-scripts@0.9
I use .env variables for the meta title of a site with various language versions of the build:
<title>%REACT_APP_SITE_TITLE%</title>
I tried like this 'NODE_ENV=development npm start' and it works well
